From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 1791) id D78C73858D38; Tue, 20 Sep 2022 16:29:14 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org D78C73858D38 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1663691354; bh=2ODXm84umGDRLXmJ2lAECiVVspsYF8hpNI+jhC6iNqs=; h=From:To:Subject:Date:From; b=GLvpVbXto+H/K/tjlVAUsExiCkQTA3MMO0GOkTNG8wfSsMFByRFa+Q+5bUnRJ/rci cXpSjK7PjouDnnYb0rR97lWOSmxN1+WxLn4e9eeMPZPe0RjO0qhPhpcyf1O5dauEVX fwE4Ux3RkXIM0fzeoiscJw+JvED3j2yydOZXS7rU= Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit From: Adhemerval Zanella To: glibc-cvs@sourceware.org Subject: [glibc] m68k: Enforce 4-byte alignment on internal locks (BZ #29537) X-Act-Checkin: glibc X-Git-Author: Adhemerval Zanella X-Git-Refname: refs/heads/master X-Git-Oldrev: c75d20b5b27b0a60f0678236f51a4d3b0b058c00 X-Git-Newrev: aeb4d2e9815d459e2640a31f5abb8ef803830107 Message-Id: <20220920162914.D78C73858D38@sourceware.org> Date: Tue, 20 Sep 2022 16:29:14 +0000 (GMT) List-Id: https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=aeb4d2e9815d459e2640a31f5abb8ef803830107 commit aeb4d2e9815d459e2640a31f5abb8ef803830107 Author: Adhemerval Zanella Date: Tue Aug 30 10:33:15 2022 -0300 m68k: Enforce 4-byte alignment on internal locks (BZ #29537) A new internal definition, __LIBC_LOCK_ALIGNMENT, is used to force the 4-byte alignment only for m68k, other architecture keep the natural alignment of the type used internally (and hppa does not require 16-byte alignment for kernel-assisted CAS). Reviewed-by: Florian Weimer Diff: --- sysdeps/generic/libc-lock-arch.h | 25 +++++++++++++++++++++++++ sysdeps/nptl/libc-lock.h | 8 +++++++- sysdeps/nptl/libc-lockP.h | 3 ++- sysdeps/unix/sysv/linux/m68k/libc-lock-arch.h | 25 +++++++++++++++++++++++++ 4 files changed, 59 insertions(+), 2 deletions(-) diff --git a/sysdeps/generic/libc-lock-arch.h b/sysdeps/generic/libc-lock-arch.h new file mode 100644 index 0000000000..4713b30a8a --- /dev/null +++ b/sysdeps/generic/libc-lock-arch.h @@ -0,0 +1,25 @@ +/* Private libc-internal arch-specific definitions. Generic version. + Copyright (C) 2022 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; see the file COPYING.LIB. If + not, see . */ + +#ifndef _LIBC_LOCK_ARCH_H +#define _LIBC_LOCK_ARCH_H + +/* The default definition uses the natural alignment from the lock type. */ +#define __LIBC_LOCK_ALIGNMENT + +#endif diff --git a/sysdeps/nptl/libc-lock.h b/sysdeps/nptl/libc-lock.h index 5af476c48b..63b3f3d75c 100644 --- a/sysdeps/nptl/libc-lock.h +++ b/sysdeps/nptl/libc-lock.h @@ -22,6 +22,7 @@ #include #define __need_NULL #include +#include /* Mutex type. */ @@ -29,7 +30,12 @@ # if (!IS_IN (libc) && !IS_IN (libpthread)) || !defined _LIBC typedef struct { pthread_mutex_t mutex; } __libc_lock_recursive_t; # else -typedef struct { int lock; int cnt; void *owner; } __libc_lock_recursive_t; +typedef struct +{ + int lock __LIBC_LOCK_ALIGNMENT; + int cnt; + void *owner; +} __libc_lock_recursive_t; # endif #else typedef struct __libc_lock_recursive_opaque__ __libc_lock_recursive_t; diff --git a/sysdeps/nptl/libc-lockP.h b/sysdeps/nptl/libc-lockP.h index d3a6837fd2..425f514c5c 100644 --- a/sysdeps/nptl/libc-lockP.h +++ b/sysdeps/nptl/libc-lockP.h @@ -32,9 +32,10 @@ ld.so might be used on old kernels with a different libc.so. */ #include #include +#include /* Mutex type. */ -typedef int __libc_lock_t; +typedef int __libc_lock_t __LIBC_LOCK_ALIGNMENT; typedef struct { pthread_mutex_t mutex; } __rtld_lock_recursive_t; typedef pthread_rwlock_t __libc_rwlock_t; diff --git a/sysdeps/unix/sysv/linux/m68k/libc-lock-arch.h b/sysdeps/unix/sysv/linux/m68k/libc-lock-arch.h new file mode 100644 index 0000000000..1844bbaf6f --- /dev/null +++ b/sysdeps/unix/sysv/linux/m68k/libc-lock-arch.h @@ -0,0 +1,25 @@ +/* Private libc-internal arch-specific definitions. m68k version. + Copyright (C) 2022 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; see the file COPYING.LIB. If + not, see . */ + +#ifndef _LIBC_LOCK_ARCH_H +#define _LIBC_LOCK_ARCH_H + +/* Linux enforces 4-bytes alignment on futex inputs. */ +#define __LIBC_LOCK_ALIGNMENT __attribute__ ((__aligned__ (4))) + +#endif